Yes, these suggestions are among my favorite things about Rakudo. There are a lot more, too. Another example: > 1 == 1 ? "sane" : "insane" ===SORRY!==

Yes, these suggestions are among my favorite things about Rakudo. There are a lot more, too. Another example: > 1 == 1 ? "sane" : "insane" ===SORRY!=== Error while compiling <unknown file> Unsupported use of ? and : for the ternary conditional operator; in Perl 6 please use ?? and !! at <unknown file>:1 Or: > loop(my $i = 0; $i < 10; $i++) { say $i } ===SORRY!=== Word 'loop' interpreted as 'loop()' function call; please use whitespace around the parens at <unknown file>:1 Easily the nicest error reporting I've seen in a compiler.